How the mighty bros have fallen. Famous “Pharma Bro” Martin Shkreli is basically begging for his life, in a letter to the judge sentencing him on March 9 in a case filed against him last year.

Shkreli was convicted of cheating investors in two hedge funds last August as the CEO of a pharmaceuticals company. You may know him from such hits as “raising the price of a lifesaving AIDS drug by a factor of 56,” and “making veiled online threats about Hillary Clinton.”

It was the latter that convinced a judge to send Shkreli back to jail after being out on bail.

Shkreli’s letter reads like the most plaintive of lyrics from the saddest of Les Mis songs.

“I was wrong, I was a fool. I should have known better,” he said in the letter. I accept the fact that I made serious mistakes, but I still believe that I am a good person with much potential. I have learned a harsh lesson,” he said. “The trial and six months in a maximum security prison has been a frightening wake-up call. I now understand how I need to change… if you find it appropriate to impose a sentence that does not include an extended period of incarceration,” Shkreli wrote, “I will do my absolute best to use my skills and whatever talents I have been blessed with for the betterment of humanity.”